Aggregation greatly boosts emission efficiency of the silole, turning it from a weak luminophor into strong emitter.

We report multilayer nanocrystal quantum dot light-emitting diodes (QD-LEDs) fabricated by spin-coating a monolayer of colloidal CdSe/CdS nanocrystals on top thermally polymerized solvent-resistant hole-transport layers (HTLs). obtain high-quality QD controlled thickness (down to submonolayer) simply solutions directly onto the HTL. The resulting QD-LEDs exhibit narrow ( approximately 30 nm, fwhm) electroluminescence from QDs with virtually no emission organic matrix at any voltage. Using...

Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Paul D. Cunningham, Nestor N. Valdes, Felipe A. Vallejo, L. Michael Hayden, Brent Polishak, Xing-Hua Zhou, Jingdong Luo, Alex K.-Y. Jen, Jarrod C. Williams, Robert J. Twieg; Broadband terahertz characterization of the refractive index absorption some important polymeric organic electro-optic materials. Appl....

Two new conjugated polymers have been designed and synthesized for polymer solar cells. Both of them exhibit excellent photovoltaic properties with a power conversion efficiency as high 4.74%. Different from the traditional linear donor−acceptor (D−A) type polymers, these newly two-dimensional structure their tunable acceptors located at end D−A side chains connected donors on main chain through an efficient π-bridge. This approach provides great flexibility in fine-tuning absorption spectra...

A series of molecular engineered organic glasses have been prepared to exploit the use complementary Ar−ArF interactions improve poling efficiency. These self-organized also used as host in binary chromophore system further number density chromophores and r33 values. Ultrahigh values (up 327 pm/V at wavelength 1310 nm) good temporal stability could be achieved these materials.

In this paper, an electron donor-acceptor (D-A) substituted dipolar chromophore (BTPA-TCNE) is developed to serve as efficient dopant-free hole-transporting material (HTM) for perovskite solar cells (PVSCs). BTPA-TCNE synthesized via a simple reaction between triphenylamine-based Michler's base and tetracyanoethylene. This possesses zwitterionic resonance structure in the ground state, evidenced by X-ray crystallography transient absorption spectroscopies. Moreover, shows antiparallel...

The review reports the recent progress in organic second-order and third-order nonlinear optical materials Jen group.

Abstract Y6, as a state‐of‐the‐art nonfullerene acceptor (NFA), is extensively optimized by modifying its side chains and terminal groups. However, the conformation effects on molecular properties photovoltaic performance of Y6 derivatives have not yet been systematically studied. Herein, three analogs, namely, BP4T‐4F, BP5T‐4F, ABP4T‐4F, are designed synthesized. Owing to asymmetric design strategies, representative conformations for Y6‐type NFAs obtained through regulating lateral...

Fluorescence imaging (FLI)-guided phototheranostics using emission from the second near-infrared (NIR-II) window show significant potential for cancer diagnosis and treatment. Clinical imaging-used polymethine ionic indocyanine green (ICG) dye is widely adopted NIR fluorescence imaging-guided photothermal therapy (PTT) research due to its exceptional photophysical properties. However, ICG has limitations such as poor photostability, low conversion efficiency (PCE), short-wavelength peak,...

We report on an electro-optic modulator fabricated from a silicon slot waveguide and clad in nonlinear polymer. In this geometry, the electrodes form parts of waveguide, driving voltage drops across 120nm slot. As result, half wave 0.25V is achieved near 1550nm. This one lowest values for any obtained to date. polymers are extremely resistive, our device also has advantage drawing almost no current, suggesting type could operate at exceedingly low power.

After a brief review on electro-optical (EO) polymers, the recent development of EO dendrimers is summarized. Both single- and multiple-dendron-modified nonlinear optical (NLO) chromophores in guest–host polymer systems showed very significant enhancement poling efficiency (up to three-fold increase) due minimization intermolecular electrostatic interactions among large dipole moment through dendritic effect. Moreover, multiple NLO chromophore building blocks can also be placed into...

Efficient light emission was obtained in a silole-based organic light-emitting diode. A high luminous current efficiency of 20 cd/A, corresponding to an external quantum 8%, achieved. The apparent violation the upper theoretical limit 5.5% for singlet emitter is discussed. With suitably designed cathode, power ∼14 lm/W obtained. strong dependence on thickness Alq3 layer also observed and explained.

A series of novel nonlinear optical (NLO) chromophores 1−4 incorporating the ferrocenyl (Fc) group as an electron donor and 2-dicyanomethylene-3-cyano-4-methyl-2,5-dihydrofuran (TCF) derivatives acceptors are presented. The use a constant Fc varied bridges makes it possible to systematically determine contribution conjugated bridge acceptor strength chromophore activity. X-ray crystal structures all four allow for systematic investigation structure−property relationship this class molecules....

Two series of highly efficient and thermally stable nonlinear optical chromophores based on the (4-diarylamino)phenyl electron donors have been synthesized systematically investigated. A modular approach has employed to synthesize these with tunable size, shape, electron-donating abilities. Efficient conjugated bridges were extended from coupled very strong CF3−TCF acceptors afford high β values (up 7077 × 10-30 esu at 1.907 μm). These possess much higher thermal stability (with their onset...

We have successfully utilized epoxyisophorone ring-opening chemistry to efficiently incorporate the butylthio group phenyltetraene bridge of highly efficient nonlinear optical chromophores in high overall yield. By following guidance Dewar's rules, sulfur atom functions as a moderate π-accepting at starred position conjugated bridge. Several very critical material parameters phenyltetraenic for device applications been intrinsically and simultaneously improved through such simple...

Extensive experimental and theoretical study suggests that interchromophore electrostatic interactions are among the most severe impediments to induction stability of large electro-optic coefficients in electric-field-poled organic materials. In this report, multichromophore-containing dendritic materials have been investigated as a means minimize unwanted attenuation nonlinear optical (electro-optic) activity at high chromophore loading. The molecular architectures employed were designed...

We demonstrate a near-infrared electro-optic modulator with bandwidth of 3 GHz and V(pi)L figure merit 0.8 V-cm using push-pull configuration. This is the highest operating speed achieved in silicon-polymer hybrid system to date by several orders magnitude. The was fabricated from silicon strip-loaded slot waveguide clad nonlinear polymer. In this geometry, electrodes form parts waveguide, driving voltage drops across 200 nm slot.

Organic electro-optic (EO) materials are of considerable interest owing to their attractive characteristics for applications in high-speed information processing and sensing. The purpose this review is highlight the areas special significance recent organic EO development. Particular attention paid advances achieving exceptional material properties (such as large optical nonlinearity excellent stability) through rational molecular design dipolar chromophores, supramolecular assembly...

We present the design, fabrication and characterization of a compact highly sensitive integrated photonic electromagnetic field sensor based on silicon-organic hybrid modulator driven by bowtie antenna. Slow-light effects in electro-optic (EO) polymer refilled silicon slot crystal waveguide (PCW), together with broadband electric enhancement provided antenna, are utilized to enhance interaction microwaves optical waves, enabling an ultra large effective in-device EO coefficient over 1000...

We design and fabricate a 320 nm slot for an electro-optic (E-O) polymer infiltrated silicon photonic crystal waveguide. Because of the large width, poling efficiency E-O (AJCKL1/amorphous polycarbonate) is significantly improved. When coupled with slow light effect from waveguide, effective in-device r(33) 735 pm/V, which to our knowledge record high, demonstrated, ten times higher than coefficient achieved in thin film material. this ultrahigh efficiency, V(π)L device only 0.44 V mm, best...

We demonstrate a ring-resonator modulator based on silicon-polymer hybrid slot waveguide with tunability of 12.7 pm/V at RF speeds and bandwidth 1 GHz, for optical wavelengths near 1550 nm. Our waveguides were fabricated 193 nm lithography, as opposed to the electron beam lithography used previous results. The is comparable some best ring-based modulators making use plasma dispersion effect. speed likely limited only by resistance in strip-loading section, it should be possible realize...

We design and demonstrate a compact low-power, band-engineered, electro-optic (EO) polymer refilled silicon slot photonic crystal waveguide (PCW) modulator. The EO is engineered for large activity near-infrared transparency. A PCW step coupler used optimum coupling to the slow-light mode of band-engineered PCW. half-wave switching voltage measured be Vπ=0.97±0.02  V over an optical spectrum range 8 nm, corresponding effective in-device r33...

Abstract Bulk‐heterojunction (BHJ) organic solar cells (OSCs) are prepared by a common one‐step solution casting of donor‐acceptor blends often encounter dynamic morphological evolution which is hard to control achieve optimal performance. To overcome this hurdle, generally applicable, sequential processing approach has been developed construct high‐performance OSCs without involving tedious processes. The morphology photoactive layers comprising polymer donor (PM6) and nonfullerene acceptor...